Literatura académica sobre el tema "Inter-fertility"

This chapter covers issues related to fertility and subfertility. It starts with lifestyle assessments that should be done as part of preconceptual care, and explains the psychological effects and counselling for subfertility alongside both male and female factors that affect difficulties in conceiving. Tests and investigations are covered for both partners, and the role of the fertility nurse specialist is defined. Ovulation induction, assisted conception, inter-uterine insemination, and IVF are all described. Pre-implantation genetic diagnosis is given a brief overview, and the chapter also explores adoption and surrogacy. Fertility preservation and the role of the Human Fertilization and Embryology Authority are covered.

The health and healthcare needs of a population cannot be measured or met without knowledge of its size and characteristics. Demography is the scientific study of population and is concerned both with the measurement, or estimation, of population size and structure and with population dynamics—the interplay between fertility, mortality, and migration which determines population change. These are pre-requisites for making the forecasts about future population size and structure which largely determine the health profile of a population and should underpin public health planning. This chapter presents information on demographic methods and data sources, their application to health and population issues, information on demographic trends and their implications, and the major theories about demographic change. The aim is to illustrate and elucidate the complex inter-relationship between population change and human health.

Abstract The first chapter surveys Macbeth’s ‘blasted heath’ as a battleground between the forces of fertility and sterility to reveal how the play adjudicates disputes over the environmental management of this terrain in Shakespeare’s day. Agrarian improvers in Jacobean Britain wished to convert heaths to enclosed farmland and therefore took a dim view of this landscape as the sinister abode of witches and fortune-telling vagrants. Yet the Scottish play also reflects the Scottish king’s fondness for heathlands as valuable hunting grounds, whose wildfowl needed protection from farmers and poachers. In promoting selective conservation of some avian species such as doves (with whom Duncan, Malcolm, and Macduff are associated) and the persecution of others like the kite (identified with Macbeth), the tragedy espouses an inter-generational but shallow ecology, in contrast to the childless Macbeths, who renounce ‘reproductive futurity’ whilst bestowing a perverse glamour on inhuman wildness.

Faba bean is an important pulse crop in terms of protein source, area coverage, and volume of annual production in Ethiopia. The aim of this paper is to assess the agronomic and crop physiology investigations in the past two decades in Ethiopia. The production limiting factors of this crop are low input usage, natural disasters, depletion of macronutrients, and unavailability of essential nutrients. Phosphorus is among the main limiting nutrients in soil systems in Ethiopia. Seed yield and biomass yield of faba bean were increased from 1338 to 1974 kg/ha and from 3124 to 4446 kg/ha when phosphorous was changed from 0 to 52 kg/ha, respectively at Holeta whereas application of 40 kg P ha − 1 resulted in higher grain yield (6323 kg ha−1) and 3303 kg ha−1 at Lemu-Bilbilo and Bore highlands, respectively. The highest grain yield of 32 kg ha−1 was obtained from the application of 92 kg P2O5 ha−1 at Sekela district while application of 46 kg P2O5 ha−1 resulted in a substantial increase in seed yield over unfertilized plots on vertisols of Ambo. On the other hand, the results suggest that using starter nitrogen from 0 to 27 kg/ha has marginally increased faba bean yield but, a farther increase of nitrogen has indicated deteriorate of yield at Arsi zone. Proper plant populations play a crucial role in enhancing faba bean production. Planting faba bean at 30 cm × 15 cm spacing gave the highest grain yield in Duna district while it was 30 × 7.5 cm at vertisols of Ambo University research farm. Significantly higher seed yield (4222 kg/ha) was observed in the 40 cm inter-row spacing as compared to 50 cm inter-row spacing, which gave the lowest seed yield per hectare (3138 kg/ha) on fluvisols of Haramaya University. Intercropping and crop rotation are cropping systems that can increase soil fertility and crop yield. Intercropping of faba bean with barley at Debre Birhan increased land equivalent ratio than both crops when planted as sole. An additional income of 18.5% and 40% was gained than planting sole faba bean and wheat, respectively at Kulumsa. Faba bean can fix about 69 kg/ha nitrogen in Northern Ethiopia. Generally, the current review results showed that only limited studies in organic and bio fertilizer, plant density, and cropping systems were done on faba bean in Ethiopia. Hence, studies regarding soil acidity, organic fertilizer, and secondary plus micronutrient impacts on faba bean production and productivity along soil types and weather conditions need great attention in the future in Ethiopia.

The use of chemical fertilizers as a supplemental source of nutrients has been on the increase but they are not applied in balanced proportion by most farmers [1]. Also, fertilizer requirements of the mixed intercropping systems have been a matter of conjecture; some studies had suggested that fertilizer requirements of the dominant component be applied [2], others recommend that the sum of the sole crop requirements, be applied [3]. Teriah [4], however, stated that both practices have proved either inadequate or wasteful. In this experiment the effects of different rates of NPK 15-15-15 ferti